A5081466060- Clay minerals and soil interactions
- Hydrogels: synthesis, properties, applications
- Surfactants and Colloidal Systems
- Soil and Unsaturated Flow
- Spectroscopy and Quantum Chemical Studies
- Polymer Nanocomposites and Properties
- Electrostatics and Colloid Interactions
- Conducting polymers and applications
- Material Dynamics and Properties
- Cultural Heritage Materials Analysis
- Mesoporous Materials and Catalysis
- Elasticity and Material Modeling
- Polysaccharides Composition and Applications
- Pickering emulsions and particle stabilization
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Geochemistry and Elemental Analysis
- Innovative Microfluidic and Catalytic Techniques Innovation
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Boron and Carbon Nanomaterials Research
- Photonic Crystals and Applications
- Iron oxide chemistry and applications
- Advanced Nanomaterials in Catalysis
- Material Properties and Applications
- Rheology and Fluid Dynamics Studies
Sorbonne Université
2021-2025
PHENIX laboratory
2021-2025
Laboratoire de physique des Solides
2023-2025
Centre National de la Recherche Scientifique
2023-2024
Université Paris-Saclay
2023-2024
In this article, ion-specific effects in aqueous solutions of polyelectrolytes (PEs) are addressed. We focus on ionene cationic chains, featuring simple structure, absence side groups, and very regular chain charge density. Ion-specific demonstrated using a series monovalent (halide) counterions. The study combines both static dynamic measurements by small angle neutron scattering, spin echo (NSE), pulsed field gradient NMR (PFG-NMR). phenomenon at high PE concentration, the nature...
The swelling behavior of smectite clay minerals has been extensively investigated due to their critical role in construction stability. Two distinct regimes have long recognized: crystalline swelling, involving the incorporation a few water sheets between layers, and osmotic characterized by complete delamination individual layers. Crystalline mechanisms well established through hydration techniques applied dry humid environment, while observed gradual concentration diluted suspension into...
The printing of colloidal particles with laser-driven microbubbles stands out as a powerful recent technique for rapid fabrication assemblies limited sample requirements and high spatial precision. However, controlling the structure resulting printed pattern remains challenge anisotropic whose orientation can significantly impact collective properties assembled structures. Herein, imogolite clay nanotubes controlled dimensions aspect ratio, that also display liquid-crystalline in suspension,...
In this study, we investigate the colloidal properties of hybrids formed by imogolite nanotubes (INTs) and poly(N-isopropylacrylamide)-co-methacrylic (PNIPAAM-co-MA), which is a thermo-sensitive copolymer suitable for drug delivery applications. The selective adsorption anionic PNIPAAM-co-MA onto positively charged external surface driven electrostatic attractions as evidenced both ζ-potential Dynamic Light Scattering (DLS) experiments. According to polarized optical microscopy (POM)...
Tuning at will the properties of gel-forming systems is key relevance for many biotechnological, agricultural, and biomedical applications. For polyelectrolyte-based gels, ion-specific effects can be an attractive way this purpose. This study investigates counterion-specific effect on microscopic structure rheological a physical hydrogel formed ionene-type cationic polyelectrolytes. The focus two monovalent halide counterions (F– Cl–) divalent counterion (SO42–). A strong appears within...
Ion-specific effects in aqueous solutions of polyelectrolytes are addressed here. We focus on ionene cationic chains, featuring simple structure, absence side-groups and very regular chain charge density. demonstrated using a series monovalent (halide) counterions. The study combines both static dynamic measurements by small angle neutron scattering, spin echo PFG-NMR. phenomenon at high polyelectrolyte concentration the nature counterion is seen to influence drastically chain-chain...
Abstract A one‐pot synthesis of plasmonic gold‐modified TiO 2 nanocomposites is reported by using glucose reduction HAuCl 4 in presence titanium tetraisopropoxide. The resulting are characterized thermal‐gravimetric analyses, X‐ray diffraction combined with fluorescence and photoelectron spectroscopies. binary system β‐TiO anatase phases obtained for low Au content while only form favored when the initial rate rises. This investigation also suggests inclusion gold structure. Although optical...
Depletion-induced self-assembly is routinely used to separate plasmonic nanoparticles (NPs) of different shapes, but less often for its ability create supercrystals (SCs) in suspension. Therefore, these assemblies have not yet reached a high level maturity and their in-depth characterization by combination situ techniques still very much needed. In this work, gold triangles (AuNTs) silver nanorods (AgNRs) are assembled depletion-induced self-assembly. Small Angle X-ray Scattering (SAXS)...
Evaporation-induced self-assembly (EISA) is a versatile method for generating organized superstructures from colloidal particles, offering diverse design possibilities through the manipulation of colloid size, shape, substrate nature, and environmental conditions. While some work highlighted importance choice substrate, this parameter often overlooked in many EISA studies. In work, we compare lyotropic liquid crystals by on hydrophilic or hydrophobic substrates, acoustic levitation (absence...
Hypothesis: Imogolite nanotubes (INTs) are anisometric particles with nanometric diameters, as carbon nanotubes. But unlike the latter, specific structure of imogolite gives appreciable properties, such monodispersity in diameter. Aluminogermanate double-walled INTs (Ge-DWINTs) obtained variable aspect ratios by controlling synthesis conditions. It thus appears an interesting model system to investigate how ratio and ionic valence influence colloidal behavior highly 1D objects. Experiments:...
The increase in use and extraction of Rare Earth Element (REE) over the last few decades has raised concerns about their behaviour environment. One factors controlling fate is adsorption onto iron (Fe) (oxy)hydroxides. In natural systems, aluminium (Al) substitutions often occur these (oxy)hydroxides, as Al also one most abundant elements at Earth's surface. Though it been shown that can have an impact on different metallic contaminants, to date, no study carried out substitution REE. To...
Imogolite nanotubes (INTs) are unique anisometric particles with monodisperse nanometric diameters. Aluminogermanate double-walled INTs (Ge-DWINTs) obtained variable aspect ratios by controlling the synthesis conditions. It thus appears as an interesting model system to investigate how ratio and ionic valence influence colloidal behavior of highly rods. The were synthesized hydrothermal treatment for 5 or 20 days modify while electrostatic interactions investigated comparing stability in...
Supercrystals, extended lattices of closely packed nanoparticles (NPs), present exciting possibilities for various applications. Under high pressures, typically in the gigapascal (GPa) range, supercrystals undergo significant structural changes, including adjustable interparticle distances, phase transformations, and formation new nanostructures through coalescence. While prior research has focused on ligand engineering's impact supercrystal mechanical response, influence NP shape remains...
Abstract This study presents the development of supramolecular gels composed β -cyclodextrin ( -CD) and carbonyl iron (CI) particles, offering an effective combination enhanced stability magnetorheological (MR) responsiveness. Unlike conventional CI-based systems prone to rapid sedimentation, -CD matrix in this composite prevents particle aggregation, demonstrating sedimentation for up 12 h without visible sedimentation. Microstructural analysis using small-angle x-ray scattering scanning...
Shear-induced orientation of clay nanoplatelets within a physically cross-linked hydrogel based on ionenes, positively charged polyelectrolytes, is studied here. Small angle X-ray scattering measurements (SAXS) are performed under shear Couette cell cylinder (rheo-SAXS). As the SAXS signal dominated by that component, we follow evolution orientational distribution as function shear. We investigate effect volume fraction, polyelectrolyte concentration, charge location and density screening...
Abstract Evaporation‐induced self‐assembly (EISA) is a versatile method for generating organized superstructures from colloidal particles, offering diverse design possibilities through the manipulation of colloid size, shape, substrate nature, and environmental conditions. While some work highlighted potential EISA to investigate phase transitions inorganic liquid crystals, influence sample environment determine their diagrams often overlooked. In this work, lyotropic crystals compared by on...